body{
    margin: 0;
    padding: 0;
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    background-color: #000000;
}
article{
    padding: 8px;
    box-sizing: border-box;
    height: 100vh;
    >main{
        width: 1200px;
        height: 96%;
        min-height: 500px;
        margin: 0 auto;
        position: relative;
        box-shadow: 0 0 10px yellowgreen;
        border: 2px solid yellowgreen;
        >div {
            width: 40px;
            height: 40px;
            background-color: #f0ffef;
            position: absolute;
            border-radius: 40px;
        }
        >section#ctrl{
            width: 200px;
            height: 10px;
            position: absolute;
            bottom: 10px;
            background-color: yellowgreen;
        }
        >h3{
            position: absolute;
            top: 20px;
            left: 20px;
            color: #f0ffef;
            font-size: 26px;
            margin: 0;
        }
    }
}